This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 2 |
| 7 | 8 |
| 8 | 40 |
| 9 | 165 |
| 10 | 712 |
| 11 | 2912 |
| 12 | 11976 |
| 13 | 48450 |
| 14 | 195580 |
| 15 | 784504 |
| 16 | 3139396 |
| 17 | 12526605 |
| 18 | 49902440 |
| 19 | 198499200 |
| 20 | 788795924 |
| 21 | 3131945190 |
| 22 | 12428258796 |
| 23 | 49295766000 |
| 24 | 195464345440 |
| 25 | 774857314042 |
| 26 | 3071175790232 |
| 27 | 12171403236288 |
| 28 | 48233597481200 |
| 29 | 191138095393700 |
| 30 | 757436171945952 |